title: Pretreatment with thymus cell-conditioned medium enhances the whole-animal survival of mice exposed to ionizing radiation.
abstract: Pretreatment with cell-free supernatant of thymus cell-conditioned medium (TCCM) protects mice in a dose-dependent manner from the lethal effect of ionizing radiation. A single dose of TCCM injected i.p. in a volume of 1.2 ml 8 h before lethal gamma irradiation with a dose of 9 Gy (LD95/30) protected 36% of C57BL/6 mice. Four doses of TCCM injected i.p. in a volume of 0.8 ml once a day (i.e., during four days), protected 50% of C57BL/6 mice. Application of five-fold concentrated supernatant of conditioned medium (cTCCM) in a volume of 1 ml i.p. 8 h before irradiation with a dose of 9 Gy protected 75% of mice. On the other hand, no therapeutic effect of different doses of the supernatant fluids from thymus cell cultures was found. Our observations suggest that media conditioned by thymus cells can mediate a radioprotective effect.
authors.affiliation: Institute of General Biology, Faculty of Science, P. J. Safárik University, Kosice.
authors.forename: P
authors.initials: P
authors.lastname: Fedorocko
authors.forename: P
authors.initials: P
authors.lastname: Brezáni
authors.forename: N
authors.initials: N
authors.lastname: Macková
mesh_terms: D000818:Animals; D002478:Cells, Cultured / Q000378:metabolism*; D003470:Culture Media / Q000008:administration & dosage; D005260:Female; D051379:Mice; D008810:Mice, Inbred C57BL; D011837:Radiation-Protective Agents; D013950:Thymus Gland; D014916:Whole-Body Irradiation / Q000401:mortality*
chemical_list: D003470:Culture Media; D011837:Radiation-Protective Agents